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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f89472bbac306915afbd2fc8fa37952eddcc45ece08068efa2e7a93182af22c5' 
  AND token = '9StfbaUuh5K2aajbOQFH5Iirvgyx3XR88HDaGfY5xvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}